Question

So I heard good things about boost log. This claims its existence:

http://boost-log.sourceforge.net/libs/log/doc/html/index.html

This is the tutorial:

http://boost-log.sourceforge.net/libs/log/doc/html/log/tutorial.html#log.tutorial.trivial

However, boost log is not part of boost. Hence not in the regular boost branch.

One can download boost log separately from here:

http://sourceforge.net/projects/boost-log/

I might just be too inexperienced, but I find the installation instructions very poor. Nonetheless, after downloading and copying the folders boost and lib into the boost folder, I can run bootstrap and bjam. This fails with errors relating to Boost.Filesystem versions, similar to the ones mentioned here:

http://boost.2283326.n4.nabble.com/Boost-Log-compilation-on-msvc-2010-fail-td3488502.html

The recommendation from Andrew Semashev (in above link) is to “Please use Boost.Log v2 (from SVN trunk).”

Looking at https://boost-log.svn.sourceforge.net/svnroot/boost-log, I can only see version 1.

Looking at http://svn.boost.org/svn/boost/sandbox/, I can find boost logging v2 by John Torjo. However, just from the syntax that might not be the boost log v2 that Andrew Semashev is talking about.

Seeing that I spend way too many hours on this already, I figured I’d get some help, and maybe some other people might profit from this post and the answers and save themselves some time. I don’t think it has been answered before, and answers like these change I supposed.

So, here goes: What is boost log v2 that Andrew Semashev is talking about? Is it the same as John Torjo’s? If not, where I can find it? And how do I build it?

Thanks

P.S. I should mention this is on Windows with Visual Studio Express 2010

P.P.S. Guess “version 2”, which is apparently just the SVN, also has problems, but with this line (see Sergio’s answer below)

<toolset>msvc:<define>BOOST_FILESYSTEM_VERSION=2

in the bjam file at least I can compile. However, this file

#include <boost/log/trivial.hpp>
int main(int, char*[])
{
    BOOST_LOG_TRIVIAL(trace) << "A trace severity message";
    BOOST_LOG_TRIVIAL(debug) << "A debug severity message";
    BOOST_LOG_TRIVIAL(info) << "An informational severity message";
    BOOST_LOG_TRIVIAL(warning) << "A warning severity message";
    BOOST_LOG_TRIVIAL(error) << "An error severity message";
    BOOST_LOG_TRIVIAL(fatal) << "A fatal severity message";
}

straight out of the tutorial, albeit now compiling and linking, doesn’t produce any output…

Answer 1

boost log v2 is simply what you get by checking out trunk, according to what Andrey says in the post you link.

indeed, it seems that this version too has got problems compiling against boost::filesystem v3.

if this is also your case, one workaround is compiling after adding

<define>BOOST_FILESYSTEM_VERSION=2

to the jamfile.

if this does not work, then, check whether you are building a single threaded or multi-threaded version of the libraries. multi-threadred boost-log should be more tested (according to Andrey).

hope this helps… I have not tried it…

EDIT:

where to add the ?

I would add it to the requirements section of boost-log/libs/log/build/Jamfile.v2, shared subsection:

project boost/log
    : source-location ../src
    : requirements
       <link>shared:<define>BOOST_LOG_DLL
       <link>shared:<define>BOOST_FILESYSTEM_VERSION=2

EDIT: from Cookie’s comment, BOOST_FILESYSTEM_VERSION=2 should be specified as

       <link>msvc:<define>BOOST_FILESYSTEM_VERSION=2

not in shared.